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So I've been having the yellow cog (transmission malfunction) appearing on my dash sometimes when I drive. When it appears it basically puts my transmission in limp mode until I turn the car off and on again, in which case it resets and everything is fine. I took it in to BMW Mississauga and after running some tests they basically said that something is wrong with the transmission but they're not sure what it is (no shit). They gave me 2 options, to rebuild it for 3.5k or get a used transmission installed for 8k. Now, I have a few buddies who are general mechanics and they found some bmw trannys for me that are going for around 1500 - 2000. I'm wondering what you guys would suggest. It seems better to get a used one and install it for 500 - 600 then to have someone rebuild it.

If it shifts perfectly fine and performs perfectly when light is reset then I cannot see why you would possibly rebuild or replace. You just need to find a more knowledgeable mechanic. Could be a sensor or reprogramming.

I can't imagine a faulty transmission working perfectly fine then randomly going into limp, unless ofcourse, something is falsely setting it off.